Final passage of hoax article (4)
I believe the answer is:
coda
'final passage' is the definition.
(I've seen this before)
'hoax article' is the wordplay.
'hoax' becomes 'cod' (I've seen this before).
'article' becomes 'a' (indefinite article).
'cod'+'a'='CODA'
'of' acts as a link.
(Other definitions for coda that I've seen before include "Concluding passage of a musical composition" , "Passage concluding a musical piece" , "bit at the end" , "Musical finale" , "Closing passage of a piece of music" .)